Device for cutting off vacuum vessels from the exhaust tubes of vacuum pumps



A g- 25, 931- G. BERTHOLD ET AL 1,820,553

DEVICE FOR CUTTING OFF VACUUM VESSELS FROM THE EXHAUST TUBES 0F VACUUM PUMPS 1116a Oct 7 1929 Patented Aug. 25, 1931 UNITED STATES PATENT OFFICE RUDOLF GOTTFRIED IBERTHOLD, 0F BERLIN-SIEMENSSTADT, AND PAUL FITTSCH, OF BERLIN-TEGELORT, GERMANY, ASSIGNORS TO SIEMENS-SCHTJ'CKERTVYERKE AKTIENGESELLSCHAFT, OF BERLIN-SIEMENSSTADT, GERMANY, A CORPORATION OF GER-MANY DEVICE FOR CUTTING OFF VACUUM VESSELS FROM THE EXHAUST TUBES OF VACUUM PUMPS Application filed. October 7 1929, Serial No. 397,892, and in Germany September 16, 192?.

Our invention relates to devices for cutting ofi vacuum-vessels from the exhaust tubes of vacuumpumps and more particularly to devices for cutting off the bulbs or vacuum- 5 vessels of large vacuum type rectifiers from the exhaust tube which is arranged so that it can be sealed after the completion of the exhausting process at the place where the cutting-oil takes place, by a sealing member adapted to be soldered in place.

It is already well known in the art to design the place where the sealing takes place in such a manner that after the completion of the exhaustion of the bulb the exhaust tube can be sealed by a special sealing memher at a place which is not contracted in the manner of a capillary tube and thus otters little resistance to the flow of the extracted air. The known devices of this type have, however, the drawback that the sealing member still offers a considerable resistance to the flow of the extracted air since this member is located usually directly in the exhaust tube of the vacuum pump.

The object of our invention is to reduce considerably the resistance to the flow of the withdrawn air by accommodating in a device of the type mentioned the sealing member prior to the soldering process in a portion of the exhaust tube located outside of the path of the outwardly flowing air, so that the sealing member offers no resistance to the flow of the air at all. According to our invention the ring serving for the reception of the sealing member is adapted to serve at the same time as terminal or contact for the leading-in wires to the rectifier bulb or container.

A referred embodiment of our invention is illustrated in the drawing affixed to our specification which shows our improved device in sectional elevaton.

Referring to this figure, 1 is the exhaust end of the vacuum bulb or container and 2 the tube leading to the vacuum pump. Between these two elements is inserted a short piece of tubing 3 which according to the D glass employed for the bulb consists of copper, iron-nickel, molybdenum or other suitable metal. At about the middle of the length of this inserted tube there is provided a ring 4 having a central bore tapering towards the bulb. It will be understood that this ring 4 may be an integral part of the tube 3 or be mounted within it in any suitable manner. The sealing member or plug 5 to be introduced into the bore of ring A which may, for instance be provided with vacuum-fused silver solder 6 for soldering it in place in thc'- iii: ring, is detachably suspended from a guiding device 7 located in a fluid branch tube 8 in communication with the exhaust tube of the vacuum pump and is adapted to be operated from outside by suitable means, such'ea as an electro-magnet acting on the iron core 9, in a manner well known in the art. Element 5 is shown seated in ring l in dotted lines, but for clearness sake in slightly smaller scale. In this position it is soldered rt to ring 4, before the pump is removed. To the ring A, which metal ring is suitable for serving as a tube terminal for the supply of current, may be attached the leading-in wires 10 of the rectifier electrode 11. W1

Various changes may be made in the structure described without departing from the spirit of our invention.

We claim as our invention:

1. A device for cutting oil vacuum vessels e so from the vacuum pump exhaust tube by a sealing member soldered in place after the exhaustion of said vessel, said device having an extension at the exhaust tube in which prior to the soldering ihe sealing member is located out of the way of the exhaust current, and a ring for the reception of said sealing member and serving at the same time as terminal for the leading-in wires of said vacuum vessel.

2. A device for cutting ofi vacuum vessels from the vacuum pump exhaust tube by a sealing member soldered in place after the exhaustion oi. said vessel, said device having an extension at the exhaust tube in whicu prior to the soldering the sealing member is located out of the way of the exhaust current, a metallic tube forming part of the exhaust tube of said vacuum vessel, a ring with tapering bore located in said metallic tubey and a tapering sealing member adapted to be soldered into said ring, said ring serving at the same time as terminal for the leadingin Wires of said vacuum vessel.

5 In testimony whereof We aifix our signatures. RUDOLF GOTTFRIED BERTHOLD. PAUL FRITSCH. 

